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A can do a work in 15 days and B in 20 days. If they work on it together for 4 days, then the fraction of the work that is left is :


or


A can lay railway track between two given stations in 16 days and B can do the same job in 12 days. With help of C, they did the job in 4 days only. Then, C alone can do the job in:

or

A, B and C can do a piece of work in 20, 30 and 60 days respectively. In how many days can A do the work if he is assisted by B and C on every third day


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